Chinese Astrology Compatibility from Two Birth Charts

Chinese birth chart compatibility can mean a zodiac-animal comparison, a BaZi reading or a Zi Wei Dou Shu comparison. The information each uses is different. A two-person BaZi and Zi Wei reading needs both birth dates and, for a complete comparison, both birth hours.

We calculated the fictional pair below with the kaucim.ai chart tool and kept the chart facts beside the interpretation. You can enter the same dates to check them. The example shows how a supportive BaZi signal can sit alongside a Zi Wei comparison that does not show a direct match.

Zodiac compatibility and full birth charts

kaucim.ai's compatibility tool uses BaZi and Zi Wei. It does not calculate Western synastry aspects. For animal pairs, read how the Chinese zodiac compatibility chart works, or look up a pair in the zodiac compatibility chart. For the Western method, Astrodienst explains synastry and relationship charts.

A zodiac lookup uses one branch per person. For example, the Six Harmonies include Rat and Ox, while the Six Clashes include Rat and Horse. A full BaZi chart has a month, day and hour pillar as well. Those other pillars can introduce different relationships between the same two people.

BaZi compatibility and the Day Master

The Day Master is the Heavenly Stem of the day pillar. In the example below, Person A has Wu Earth and Person B has Bing Fire. The traditional Five Elements cycle has Fire producing Earth. That gives the reading a direction of support to examine.

The remaining pillars still matter. A generating relationship between two Day Masters does not establish whether either person needs that element, enjoys the support or wants a relationship. The BaZi compatibility guide explains the broader comparison. The BaZi marriage guide looks more closely at the Day Branch and spouse-star conventions.

The two meanings of Spouse Palace

In BaZi, Spouse Palace usually means the Earthly Branch of the day pillar. In Zi Wei Dou Shu, it is one of twelve palaces containing stars. The two labels refer to different chart structures.

A Zi Wei comparison can check the stars in Person A's Spouse Palace against Person B's Life Palace, then examine the reverse direction. Where a Life Palace has no major stars, our comparison refers to the major stars in the opposite Travel Palace and records that borrowing. An empty palace does not mean that a person has no relationships.

Read the Zi Wei system overview if the palace names are new to you. The iztro chart documentation describes the chart data used by our calculation library.

A worked compatibility example

Persons A and B are fictional. Their details were chosen for this tutorial and are also used for the two demonstration wheels on the compatibility page. There is no customer story behind them. A is entered as female and B as male for cycle direction. Hours use the entered clock-time window, with no automatic true-solar-time or daylight-saving adjustment.

The table contains calculated facts. The following passages are an editorial teaching example, not a transcript of an automatically generated report or evidence of events in these people's lives.

Start with one supportive signal

B's Bing Fire produces A's Wu Earth in the traditional element cycle. A reading can use this to ask how A receives help from B. Does that help meet a need, and does B feel comfortable offering it? The dates cannot answer those questions. The people would need to check them against their experience.

This is one part of the chart. It does not measure affection or tell us that B must contribute more to the relationship.

Follow the source of a caution

Our Zi Wei comparison also applies the birth-year transformations across the two charts. B's Bing year assigns Ji to Lian Zhen. Lian Zhen sits in A's Life Palace, which the comparison marks for attention.

An editorial reading might ask whether a particular attempt to help leaves A feeling judged. If that has happened, the pair could revisit the conversation and identify what was needed at the time. If it has not, the interpretation should be set aside. A Ji placement cannot prove that either person behaved badly.

Keep different findings separate

A's Spouse Palace contains Qi Sha. B's Life Palace borrows Tian Ji and Ju Men from the opposite palace. Those stars do not directly match Qi Sha, and our two-way Spouse Palace and Life Palace check records no correspondence for this pair.

The BaZi generating relationship and the Zi Wei result can both be reported. They test different conditions. Adding them into a compatibility percentage would hide which finding came from which method. Keeping the two findings separate gives the reader something specific to question.

Comparing charts without a birth time

You can start on kaucim.ai if one or both hours are unknown. For that person, BaZi omits the Hour Pillar and retains the date-based Day Master and Day Pillar. Zi Wei uses a reference hour and marks the chart uncertain. Its Life Palace, Spouse Palace and their stars cannot be confirmed, so comparisons that depend on them remain tentative.

Select the unknown-hour option. Do not choose a time because its reading sounds familiar. If a birth record later confirms the hour, calculate the pair again with the corrected information.

How to get a two-chart comparison

Use the two birth charts compatibility tool when you have both people's permission and birth details. It gives a free overview before any purchase. The full report develops the interpretation; the current options and prices are shown on the tool page. The detailed table in this tutorial is a teaching aid, not a promise that every item appears in the free overview.

The calculation uses the gender setting for traditional cycle direction. People of the same gender can enter their details. A chart cannot establish another person's sexuality, feelings or consent.

A reading may give you a useful question to discuss. It cannot predict marriage, decide whether you should stay together or replace help with a safety concern. Actual conversations and choices remain outside the chart.